Do custom kernels significantly increase battery life? - Google Pixel 3 XL Questions & Answers

So I just picked up a pixel 3 and the battery life is fairly mixed but I guess I was spoiled with my previous device (Oneplus 5).
Will installing a custom kernel improve my battery life? I haven't really bothered since my Galaxy S2 which was a shambles.
If so, are there any specific kernels which aim to do this by default?

android8bit said:
So I just picked up a pixel 3 and the battery life is fairly mixed but I guess I was spoiled with my previous device (Oneplus 5).
Will installing a custom kernel improve my battery life? I haven't really bothered since my Galaxy S2 which was a shambles.
If so, are there any specific kernels which aim to do this by default?
Click to expand...
Click to collapse
Today, stock Google kernels are very efficient. Most kernel devs will tell you the same. There is just not much margin left for them to improve upon battery-wise. That being said I use EX Kernel because I like the ability to tinker and have more control over the phone. I like EX's battery monitor that is part of his kernel manager. There are quite a few good custom kernels out there. If you haven't done so already, just lurk in one or two of the kernel threads and see what people are discussing. With respect to your current battery life, don't forget to give it several full charging cycles and in a week or so it will likely show an improvement. That, and you're probably "playing" with it more and that will wear off too! :laugh:

There will be none to negligible difference. Custom kernels are more for staying up to date with incremental kernel patches and other upstream stuff as well as things like color and haptic control.
Sent from my Pixel 3 XL using XDA Labs

And to fix memory management issues

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Best Battery Rom

So I am thinking that JB Roms are still in development and won't have good battery. Is there any good battery roms on ICS?
Also are there any gingerbread roms?
You would be thinking right seeing as jb just came out. Just search and see what people are commenting on, battery wise
DO YOU JELLY?
Can i have a ICS rom and a JB rom running on Boot Manager or do they have to be the same?
I also want to know the answer to this question.
There is no best battery ROM. each ROM behave differently. they will give good battery for some, and bad for others.
what do you reccomend?
It's really less about the ROM, and more about the kernel you use...whether you undervolt or underclock or not, how you set up your apps, and how you use your phone. I'm using mROM at the moment, with Franco's kernel, undervolted. I just swapped kernels today, so I can't speak to the battery life just yet.
Sent from my Full AOSP on Toro-VZW using xda premium
+1 on the kernel being important for battery life.
I chose AOKP for its high customization. Lots of ROMs are as smooth, or even maybe a little smoother than AOKP, but many are just way too bare bones for me. I find AOKP to be the best package for my style, allows for nav bar control, notification control and toggles for phone features in the notication tray and many many more things. Plus, on the market there are many AOKP theme apps like Kiwi Cobalt or Purple Kush that make your phone look saaaa-weeeeeet.
And I always run Trinity kernels on my Nexus for battery life. Not sure why, but they seem to give my phone the best life. I haven't had luck with franco or other kernels in that aspect. But every phone and setup is different.
The combo I am running is the best I have found for a perfect balance between great speed and really good battery life on my phone.
Just remember to do backups. :good: The most important thing I can recommend, especially if new to flashing/custom-ing like myself.
mattwilkinson11 said:
So I am thinking that JB Roms are still in development and won't have good battery. Is there any good battery roms on ICS?
Also are there any gingerbread roms?
Click to expand...
Click to collapse
I have NEVER tried this Rom.
But the Redemption Rom is supposed to be fast and have amazing battery life.
The catch is ZERO features. Just Stock. But that is why it's so fast apparently and have amazing battery.
Maybe u get to the Softkeys bar, I dunno.
Jellybean ROMs are smashing ICS in terms of battery life on the Nexus, and I think it may be a result of better RAM management. If you're just not ready to take the plunge on JB (source based ROMs are out now btw), and want a mix of customization, and battery life, CM9 may be the way to go. As for Gingerbread... hmmm... I doubt there are any ROMs available for the Nexus, and it sounds like a harsh, Benjamin Button type thing to do to such a great phone, lol.
Sent from my Full AOSP on Toro-VZW using xda premium
Here's my take on what really effects battery life:
As long as you have a ROM that doesn't malfunction and keep the phone active when it shouldn't be, all ROMs should get around the same battery life. If they don't, it's probably because you don't know about the difference in their settings - one might simply be using a more aggressive CPU governor. Even if you have a ROM that does absolutely nothing as much as possible, you are the cause of battery drain. I've tried all sorts of ROMs, and in the end, I'm the one causing battery drain. Whether it be me being sloppy and accidentally allowing too many background settings for apps, or me using more battery intensive features, I'm the one draining the battery in the end. From my experience, Stock, Liquid ICS, CM9, AOKP, Jelly Bean, Jelly Bean AOSP, any kernel you want to try, the user has the most affect on the battery life. Try adjusting your habits to improve battery life. I'm a heavy, heavy user (Sometimes with unlimited amperage from a 2.1amp charger, my phone still will die while charging.) I'm also in the Army, and when I know I will be in the field without power for extended periods of time, I change how I interact with my phone. Maybe don't overclock, even underclock/undervolt, use a more strict governor, even disable a CPU core, change Android settings to not allow ANY background apps, always turn off 4G and syncing, of course turn off BT and WiFi when not needed. I change from a user who can barely make it through the day to a user that can make it almost two. If you want something to give you better battery life without changing your habits, go buy a bigger battery or a newer phone.
Trinity 307 kernel all the way!!! Add in its conservative governor option and your conserving a lot of battery. Not to mention the kernel runs at a very low temp so your device will last well beyond the end of your 2yr contract plus it comes with a stock color mod thing that makes your gnex look amazing IMO.

Which kernel do you prefer for best battery backup?

I am not asking which one is the best, but which one would you prefer for best battery backup? Samsung's latest release is forcing me to use a custom kernel, but I'd like to know which one I should use as I am not freak about flashing plenty stuffs.
Thanks in advance.
Redpill or uneak or perseus. You can try them all.
Sent from my GT-N7100 using xda app-developers app
Yeah, but I don't want to try them all bro. I know they all are great but that's why I asked which one is the preferable for battery backup specifically.
I am on Perseus now, I hope I've made the right choice. Lets see...
Persues is good for battery.neak is battery drainer.my experience
You're not asking which ones the best, but I'll tell you. I have used all the available kernels for my Note 2, and in my experience RedPill is the only one that is giving me consistent and best battery and overall performance. With more and more updates the developer has been adding more and more options. You can also undervolt the CPU and GPU with RedPill for further enhance your battery life. I had huge battery problems on my S3, So i had to go through a bunch of crap like different custom roms, undervolting, under-clocking etc to achieve good battery life. But when i got my Note 2 i used it for a few days completely stock and un-modified. And i was surprised at how amazing the battery life was. But if your having problems i can recommend AllianceRom + RedPill kernel, than undervolt the CPU/GPU (The utility needed to do so comes with the kernel, after flashing there will be an app installed on the phone called STweaks). And do some other minor adjustments to achieve incredible battery life. If you need any help or additional information you can contact me anytime.
I also want to know...
I would also like to know this as well. Since upgrading to 4.1.2 I am having bad battery backup, never thought of switching kernels but now I have to.
Shame on you Samsung....

[Q] Battery life: stock VS custom roms and remedies

Hi guys!
I've been playing around with my GNex (GSM, stock 1750mAh battery) since last july and my biggest concern is (still) the battery life.
I've noticed that the couple stock rom + stock kernel (the ones the phone come with) is much better than any other custom rom+kernel.
Here comes my (maybe stupid) question: is the battery life somewhat related to the (de)odexed status of the rom?
I mean, I've been looking for all kinds of solutions to take advantage of those features offered by AOKP or PA without suffering from BL issues, but I find silly to sacrifice stability/smoothness/responsiveness/always-on-connection/brightness/whatsoever to gain not that many mins of juice. And I really wonder what is the sourcery Google adopts to make its roms so stable, responsive and battery friendly (e.g. no custom rom/kernel can achieve as much BL as the stock ones). Put differently, with the stock rom/kernel, I can leave 3G always on, auto-sync always on, haptic feedbacks on, location services always on (but GPS) and the battery survives for more than 24h; while, with custom roms/kernels, I could switch everything in the list off and still the battery wouldn't last that long (ceteris paribus).
Could you, please, explain me how it works?
Is there really no way to improve BL other than those listed above?
And, finally, does odexing the system apps (on custom roms) do the trick?
Cheers!
P.s.: the answers I'm looking for may already be in other threads.
If so, I apologize, but I tried googling different keywords many times, and got no interesting results.
For me the biggest source of battery drain is the screen by far. Maybe you enjoy custom ROMs more than the stock one and you keep the screen on more I would think that a custom ROM would be more battery friendly. Which ROMs have you tried?
Endriu90 said:
Hi guys!
I've been playing around with my GNex (GSM, stock 1750mAh battery) since last july and my biggest concern is (still) the battery life.
I've noticed that the couple stock rom + stock kernel (the ones the phone come with) is much better than any other custom rom+kernel.
Here comes my (maybe stupid) question: is the battery life somewhat related to the (de)odexed status of the rom?
I mean, I've been looking for all kinds of solutions to take advantage of those features offered by AOKP or PA without suffering from BL issues, but I find silly to sacrifice stability/smoothness/responsiveness/always-on-connection/brightness/whatsoever to gain not that many mins of juice. And I really wonder what is the sourcery Google adopts to make its roms so stable, responsive and battery friendly (e.g. no custom rom/kernel can achieve as much BL as the stock ones). Put differently, with the stock rom/kernel, I can leave 3G always on, auto-sync always on, haptic feedbacks on, location services always on (but GPS) and the battery survives for more than 24h; while, with custom roms/kernels, I could switch everything in the list off and still the battery wouldn't last that long (ceteris paribus).
Could you, please, explain me how it works?
Is there really no way to improve BL other than those listed above?
And, finally, does odexing the system apps (on custom roms) do the trick?
Cheers!
P.s.: the answers I'm looking for may already be in other threads.
If so, I apologize, but I tried googling different keywords many times, and got no interesting results.
Click to expand...
Click to collapse
Thats strange, to me battery life is better with custom ROMs and kernels
R: [Q] Battery life: stock VS custom roms and remedies
sirxdroid said:
For me the biggest source of battery drain is the screen by far. Maybe you enjoy custom ROMs more than the stock one and you keep the screen on more I would think that a custom ROM would be more battery friendly. Which ROMs have you tried?
Click to expand...
Click to collapse
Lol, maybe you're right!
Until now, I tried AOKP and PA roms and franco, AirKernel, GlaDOS and stock kernels (all possible combinations). I found that PA and GlaDOS are the best custom couple, but still not comparable with the factory ones.
However, even tough I have no technical numbers, the usage on custom stuff had been more or less the same as on stock things (although I became a pie-control addict). And what I know for sure, the BL gap is mostly due to screen (i.e. by staring at the launcher home screen for 5 minutes, the battery drains faster with custom roms than with stock roms - still, ceteris paribus).
NexusS4gFreak said:
Thats strange, to me battery life is better with custom ROMs and kernels
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Click to collapse
I know that's strange. Things used to work as you say with my HTC Desire. But since I've switched to the Nexus S (and then to the GNex), I strongly preferred stock stuff just because of battery life
Sent from my stockish Galaxy Nexus using xda app

Kernel Recommendations?

I just got myself an M8 which I unlocked and started using 4 days ago. I am used to using the Galaxy S phones and Ktoonsez Kernel for my devices. I am completely new with this device and currently running the LeeDroid ROM and I am wondering if anyone has any kernels they recommend for this device. I am looking for the best balance of Performance, Battery and ease of customization.
Thanks!
I find kernels don't make much of a difference, for my usage... So I usually use whatever comes with the rom.
But I do know two of your reasons contradict each other. Performance and battery life. Usually you slightly sacrifice one for the other.
Edit: Stock kernels, and ones included with roms are already designed for a good balance. Older devices needed more tweaking to gain different outcomes, but newer devices aren't nearly as impacted by kernel tweaks. My opinion of course.

ROM with best battery life!

*If a good thread already exists about this, please link it.*
Hey Peeps!
I have probably tried all ROM's (Sense & Stock) on my aging M8, and the only ROM that comes with good battery life is ARHD. But, as we all know, it has its weaknesses.
Waiting for responses from you guys!
We do not compare ROM's that has the greatest etc. The best way to find it out is to try each ROM which fits you.
Sent from my HTC One_M8 using Tapatalk
There is no such thing as a ROM with "best battery life" that applies to everyone, in every situation. There are simply too many variable on how different folks use their phones (what apps, screen on time, etc.) your local reception, whether on LTE or 3g, WiFi, Bluetooth in use, etc. etc. etc.
Folks have very different experiences for each ROM. Seriously, I've seen some ROMs where I can get 2 days of light usage, where others on the same ROM will say battery life sucks and only lasts a few hours.
You need to use trial and error, and use what ROM works best for you. There are no shortcuts to that process.
XDA changed their rules some time ago to allow comparison threads as long as they dont turn into a flame war. Please keep this thread civil and respect everyone opinion.
Thanks
Wolf
redpoint73 said:
There is no such thing as a ROM with "best battery life" that applies to everyone, in every situation. There are simply too many variable on how different folks use their phones (what apps, screen on time, etc.) your local reception, whether on LTE or 3g, WiFi, Bluetooth in use, etc. etc. etc.
Folks have very different experiences for each ROM. Seriously, I've seen some ROMs where I can get 2 days of light usage, where others on the same ROM will say battery life sucks and only lasts a few hours.
You need to use trial and error, and use what ROM works best for you. There are no shortcuts to that process.
Click to expand...
Click to collapse
what type of effect does it exist on kernel with battery life?
what are the good & bad things of custom kernel? and also can kernel affect on radio?
umesh.lk said:
what type of effect does it exist on kernel with battery life?
what are the good & bad things of custom kernel? and also can kernel affect on radio?
Click to expand...
Click to collapse
I'm not that knowledgeable about kernels, and in particular don't mess much with custom kernels.
But what I would say, is that those questions aren't any more answerable then the previous points about custom ROM vs. battery life. Overclocking and undervolting allowed by custom kernels, as well as the choice of governors (which provide various balances of performance versus power usage) will all have some affect on battery life. But the experience is going to vary greatly from one user to another.
Similar to trying custom ROMs, just make a TWRP backup before flashing anything; try some custom kernels, or tweaking kernel settings; and see if the results are desirable to you.
The only real "bad" thing about custom kernels, is that some settings may result in instability, boot loops or no boot. But as long as you make a TWRP backup (before flashing kernels or changing kernel settings), you can easily recover from any such problems.
You also may or may not get the performance or battery life you are looking for, from custom kernels. Which is the main reason I've not been one to personally mess with custom kernels too much. With what kernel tweaking I did on other devices, I never saw a significant performance difference. And certainly not enough to warrant the hassles of system crashes and no boots I was getting.
But others will swear by custom kernels, different governors, etc. Again, your results can and will vary. So that is why its best to try for yourself; and not take another's advice as gospel.
Viper rom is quite good.

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